@FearNLoathing, you need to use your ether wallet address. As @vaX‌ indicated here, if you do not know your ether wallet address, you need to:

1. Open 'TextEdit' (on mac) or 'NotePad' (on win)2. Click 'File' in the navigation bar (top of screen) of whichever app you're using3. Select 'Open'4. Locate the .json file that you downloaded5. Open it6. When the file opens (in TextEdit or NotePad), press 'command + F' (mac) 'CNTRL+F' (win) to enable search (you'll be searching the contextual content of your .json file)7. In the 'find' field, type: ethaddr (the app will then search the .json file and highlight: ethaddr)8. The number in quotations, to the right of the word 'ethaddr', following ":" is your ether address.

If after all this you are still struggling, please contact helpdesk@ethereum.org.